Get Up To $1,500 With BetMGM March Madness Bonus Code THELINES

College Basketball, March Madness, MGM, Promo

Written By Road to CFB | Last Updated March 19, 2025

If you’re a college basketball fan, likely the two most important items on your to-do list this month include filling out your bracket and claiming the latest BetMGM Sportsbook promo for March Madness.

New users can get up to $1,500 with bonus code THELINES at BetMGM. Place your first wager with the sportsbook and, if it loses, you’ll receive a refund in the form of bonus bets (up to $1,500). With a wide-open March Madness field, we may see the most upside-down bracket in recent memory. But with BetMGM’s first bet promo, you’ll have less to sweat when it comes to being the next victim of a Saint Peter’s or Oakland Round 1 upset.

Let’s dig in to how you can claim this promo in time for the NCAA Tournament.

Get $1,500 For March Madness With BetMGM Bonus Code THELINES

Click PLAY NOW in the banner below and use promo code THELINES to get started!

Up to $1,500 Welcome Bonus at BetMGM Sportsbook

Up to $1,500

In Bonus Bets

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Up to $1,500 in Bonus Bets if Your First Bet Doesn't Win*
*Bonus Bets Expire in 7 Days. One New Customer Offer Only. Add’l terms. 21+. Gambling Problem? Call 1-800-GAMBLER
Use Bonus Code: THELINES

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BetMGM Offers Top Bonus Code For March Madness

New users are eligible for this BetMGM signup bonus. Download the BetMGM Sportsbook app from the App Store (iOS) or Google Play (Android) and create a free account. At signup, you’ll need to provide your legal name, street address, birthdate, and the last four digits of your Social Security number. These bits are necessary to validate your identity and eligibility. Most sportsbooks and states require users to be at least 21 years old.

When entering sensitive information (of any kind), we strongly recommend using a password-protected internet connection.

Once your account is ready, navigate to BetMGM’s promos tab or click PLAY NOW in the banner above. Using code THELINES opts you into the promo. Next, it’s time to make your first deposit. BetMGM accepts a number of banking methods:

Credit card
Debit card
Bank transfer/e-check
PayPal

Always read the terms and conditions before making your first deposit.

How Does The BetMGM March Madness Bonus Work?

Your first bet at BetMGM Sportsbook is covered with this promo code. Place a wager on any market and, if it loses, BetMGM will refund your bet amount — up to $1,500 — in bonus bets. Those bonus bets will appear in your account within 72 hours of your initial bet settling (but most times far earlier than that). Be sure to use the credit within seven days or it expires!

We’ve all been on the losing end of a monumental 15-over-2 or 14-over-3 upset when filling out our brackets. Perhaps you were bitten by UMBC’s legendary upset over No. 1 Virginia. With this first-bet promo, you’ll have less to sweat about when it comes to those upsets busting your bankroll along with your bracket.

Expert Picks For March Madness

A sound way to ensure you don’t fall victim to betting on flawed high seeds is to follow along with our coverage of March Madness odds. College hoops expert Eli Hershkovich will be breaking down all the madness in the NCAA Tournament this month. He’ll provide analysis on every game and picks for every round.